Dynamo-electric machine.



0. B. SKINNER & T. S. SCOTT.

DYNAMO ELEGTRIG MACHINE.

APPLIGATXON FILED JAN. 16, 1906.

1,077,374, Patented Nov. 4, 1913. I

WITNESSES:

I ATTORNEY UNITED STATES PATENT OFFICE.

CHARLES E, SKINNER, v()IE WILKINSBURG, AND THOMAS S. SCOTT, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A QQRPOBAATION OF PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented Nov. 4, 1913.

Applieationjfiled January 163, 1906. Serial No. 296,329.

To all whom it mayeoawema Be it known that we, CHARLES E. SKIN- mm and THO-MAS S. lSeo'r'r, citizens of the United States, and rQ idents, respectively, of WilkinSburg and of Pittsburgh, in the county of Allegheny and istate of Pennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, of which the following is a specification.

:Our invention relates to dynamo-electric machines and particularly to machines in which resistance conductors are employed duce the amounts of current that may traverse the local short-circuits in the armature windings that are formed when ad acent commutator segments are connected by the brushes, and these conductors are often placed in the bottoms of the core slots, underneath the armature coils. The portions of the coils and of the resistance conductors that project from the core slots are usually supported upon cylindrical brackets that form parts of the armature structure and are secured thereto by means of bands.

WVhen the resistance conductors are com posed of thin strips that are folded upon. themselves, the folded ends of which .project.

from the core slots at one end of the armature, it is inadvisable to bind the armature coils directly and tightly upon them, and We have accordingly provided the support ing structure with ribs or teeth that correspond to the core teeth and in the slots between which the straight projecting portions of the resistance conductors are located, a smooth cylindrical supporting structure being thus provided for the superimposed armature coils.

Figure 1' of the accompanying drawing is a plan view of a portion of an armature that is constructed in accordance with our invention, part of the structure being broken away for the sake of clearness of illustration. Fig. 2 is a view, in section, of a portion of the armature shown in Fig. 1. Fig. ;3 is a View, in end elevation, of a portion of ';the supporting bracket for the ends of the resistance conductors and armature coils that project from the core slots, three of the armature core teeth being indicated by broken lines, and Fig. 4 is a diagrammatic .view ofa portion of the winding that is aplplied to the armature shown in Figs. 1 and 7.5. An armature core 1 having peripheral g slots 2 that are partially inclosed at the pe triphery, and the outer port-ions of which are %wider than the inner portions, is provided with anarmature winding comprising aplu rality of coils each of which is composed of :two sections 3 and l that are located one above the other in the wider portions of the gcore slots and the ends of which are conjnected by means of suitable clips 5 that are isoldered or otherwise secured thereto. The garmature winding is connected to segments .of a commutator 6 by means of comparaitively high resistance conductors 7 that .are @located in the lowermost portions of the core slots, underneath the armature coils, and that are composed. of folded strips of sheet metal, such as German silver, the folded ends of which, in the present instance, pro.- ject from the core slots at the end of the larmature remote from the commutator. 'iThese projecting ends of the resistance conductors are not bent, as the ends of the winding conductors are, but are extended straight from the core slots. hen so constructed, a plurality of the resistance conductors may be assembled into a group, .and the groups may be inserted as units into the ends of the partially closed armature slots. An end-ring or bracket 8 that retains the magnetizable core 1 in position is provided with ribs 9 on its cylindrical face to correspond, respectively, to the teeth of the armature core and between which the folded projecting ends of the resistance conductors 7 are located. These ribs serve to fill the spaces between the projecting ends of the resistance conductors, so that a smooth, cylindrical, supporting surface is provided for the bent projecting ends of the armature coils and all danger of crushing these portions or injuring the insulation thereof is obviated. The coils and resistance conductors are secured in position upon the end bracket by means of bands 10 of wire, an insulating and protecting covering 11 being first applied.

While we haveshown the resistance conductors as folded flatwise upon themselves. they may, if desired, be bent edgewise, the sections being placed one above the other, and it will be readily understood that, if the conductors connect to the winding at the end of the armature remote from the commutator, the portions thereof that project from the armature slots may be supported in a manner similar to what has been described.

e claim as our invention:

1. The combination with a slotted armature core, a plurality of coils located in the core slots, and auxiliary conductors located in the core slots and beneath the armature coils, of an annular supporting bracket having peripheral slots or recesses in which the ends of the auxiliary conductors are supported.

2. The combination with a. slotted armature core, a winding therefor comprising a plurality of coils located in the core slots, and commutator conductors located in the core slots and beneath the armature coils, of an annular supporting bracket having peripheral slots or recesses in which the ends of the commutatorconductors are supported.

3. The combination with a slotted armature core, a plurality of coils located in the core slots, and folded auxiliary conductors located in the core slots, beneath the armature coils, the folded ends of which project therefrom, of an annular supporting bracket having peripheral slots or recesses in which the folded projecting ends of the conductors are supported.

4. The combination with a slotted armature core, and a winding therefor the conductors of which project from the core slots, of an annular supporting bracket for the projecting portions of the conductors having peripheral ribs between which some of the conductors are supported and upon the ends of which other conductors are supported.

5. The combination with a laminated and slotted armature core and a winding therefor, the conductors of which project from the core slots, of an annular member that retains the core laminae in position and is provided wit-h peripheral ribs between and upon which the projecting portions of the conductors are located and supported.

6. The combination with a slotted armature core, and a winding therefor the conductors of which project from the ends of the core slots in a plurality of layers, of an. annular supporting member at the end of the core having radial peripheral ribs between which are supported the conductors pertaining to the inner layer and upon the ends of which are supported conductors pertaining to another layer.

7. The combination with a slotted armature core, and, a winding having an inner layer of conductors that project from the end of the core in straight lines, of a supporting member at the end of the core having slots in alinement with the core slots to receive the ends of the straight conductors.

8. The combination with a slotted armature core, and a winding therefor having an inner layer of straight conductors, of an end ring provided with slots in alinement with the core slots to receive and support the ends of the straight conductors.

CHARLES E. SKINNER. THOS. S. SCOTT.

\Vitnesses A. M. SKINNER, LOUIS W. MrLLIs,

BIRNEY Hines.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

